#include "timer.h"

/**
  * @brief  TIM3 Configuration
  * @param  arr:预分频值  psc:预装载值
  * @return None
  */
void TIM3_Int_Init(uint16_t arr,uint16_t psc)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	NVIC_InitTypeDef NVIC_InitStructure;

	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); 
	

	TIM_TimeBaseStructure.TIM_Period = arr; 
	TIM_TimeBaseStructure.TIM_Prescaler =psc; 
	TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; 
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
	TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
 
	TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); 


	NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;  
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 
	NVIC_Init(&NVIC_InitStructure); 


	TIM_Cmd(TIM3, ENABLE); 			 
}

void TIM3_IRQHandler(void)   
{
	if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)  
		{
      TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );  
		}
}












